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Everytime I play the lowest E natural, a noise occurs inside the piano. It is almost a "rattle" type of noise. I thought the string was broken at first, but I can see no visible damage, and nothing fell in or anything. What can the problem be?

CrashTest, I once has a buzz coming from inside my piano when I played certain notes and it turned out to be a loose screw on the latch which the lid rests on when closed. So maybe something has come loose? You might need a technician.

"Hunger for growth will come to you in the form of a problem." -- unknown

Make sure it's actually IN the piano. Those noises can be deceiving - we had a buzz from a couple of notes, and it turned out to be the strings on one of the stringed instruments that is hanging on the wall above the piano. We also had a buzz from a loose washer/screw assembly on one of the piano legs, occasionally, one of the pedal rods buzzes, and sometimes, the hinge on the fall board has a buzz, and it stops if you just move the fall board back and forth a little. Is your piano an upright or a grand? Our tech told us a story about a grand that had a sound just like a cracked soundboard, and it turned out to be a little candy wrapper stuck in the back under one of the strings. Someone else here had a light fixture that was vibrating when the piano played a certain frequency. Good luck! Jodi

Check to see if the damper wire is touching the string when vibrating. Also it might be a loose winding on the string. In all likelyhood it is something easy and inexpensive to repair. Check with your tech.

Jodi and Steve have covered most of the bases. But string seating on the bridge and plate can also be the cause of such a noise. Of course the old tuners joke is " The reason your hearing a rattle is due to a loose nut behind the keyboard ".